某复杂稀有金属伴生矿选矿试验研究

内蒙古某稀有金属伴生矿REO含量0.28%,Nb2O5含量0.24%,铁品位5.72%,稀土和铌矿物嵌布粒度微细,稀土矿物主要有氟碳铈矿和独居石,铌矿物主要为钽铌锰矿和钇复稀金矿,铁钛矿物为钛磁赤铁矿、锰钛铁矿,脉石矿物主要有石英和长石。分别研究了重选、磁选及磁选—重选联合流程对原矿稀土、铌、铁的预富集效果。结果表明,重选对原矿中铁、稀土和铌的预富集效果不理想,高梯度磁选和磁选—重选联合工艺可获得较好的预富集效果。在磨矿细度-74μm含量占82.5%,磁场强度1.0 T的条件下,高梯度磁选试验可获得TFe 32.59%、REO含量1.57%、Nb2O5含量1.34%的粗精矿,三者回收率分别为85.57%、85.20%和86.94%,粗精矿可采用冶金工艺分离提取稀土、铌、铁。

Beneficiation test research of a complex rare metal associated ore

Inner Mongolia a rare metal associated ore contains 0.28% REO, 0.24% Nb2O5 and 5.72% TFe, in which the dissemination size of rare earth and niobium minerals are very fine. Rare earth minerals are mainly bastnaesite and monazite, niobium minerals are mainly tantalum niobium ore and yttrium polycrase, iron-titanium minerals are titanium magnetic hematite and manganese titanium iron ore, and gangue minerals are mainly quartz and feldspar. The gravity separation, magnetic separation and magnetic separation-gravity separation combined process are explored. The test results indicate that gravity separation has poor enrichment effect on the iron, rare earth and niobium of the raw ore, and high gradient magnetic separation and magnetic separation-gravity separation combined process both obtain good pre-enrichment effects. When the fraction of the material size which is less than 0.074mm is 82.5%, and the magnetic field intensity is 1.0T, rough concentrate with 32.59% TFe, 1.57% REO and 1.34% Nb2O5 can be obtained through high gradient magnetic separation, and their recovery are 85.57%, 85.2% and 86.94% respectively. The rough concentrate can be separated and extracted rare earth, niobium and iron by metallurgical process.